Bug: Infinite loop in org-agenda-dim-blocked-tasks

Bug: Infinite loop in org-agenda-dim-blocked-tasks

[Al Haji-Ali]

On the latest release (9.3.7), I am running into an infinite loop when clocking in a blocked task if `org-enforce-todo-dependencies` is set to `t`.

The (manual) call stack is:
org-agenda-clock-in
org-agenda.el:9760 org-agenda-change-all-lines
org-agenda.el:9391 org-agenda-finalize
org-agenda.el:3879 org-agenda-dim-blocked-tasks

The while loop on line 4012 is infinite in this case.
The problem is because when `org-agenda-finalize` is called, the region is narrowed to a single line. Then in `org-agenda-dim-blocked-tasks` the function `(move-beginning-of-line 2)` is called to advance the point, which does not work when the buffer has a single line.

In an earlier version, the command `(forward-line)` was called which moved the point to eol when the buffer had a single line.

-- Al

Emacs  : GNU Emacs 27.1 (build 4, x86<sub>64</sub>-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2020-08-21

Re: Bug: Infinite loop in org-agenda-dim-blocked-tasks

[Bastien]

Hi,

Al Haji-Ali <abdo.haji.ali@gmail.com> writes:

> On the latest release (9.3.7), I am running into an infinite loop when
> clocking in a blocked task if `org-enforce-todo-dependencies` is set
> to `t`.

From memory, this has been fixed in the master branch.

If you can check from there and confirm the fix, that'd be great,
otherwise just wait for the 9.4 release.

Thanks,

-- 
 Bastien

Re: Bug: Infinite loop in org-agenda-dim-blocked-tasks

[Aaron L. Zeng]

(Sorry, I am resending this email because I found out gmail doesn't support
In-Reply-To in mailto: links).

Unfortunately, I think this bug is still there (I also didn't see any
commits addressing it, but I could have missed it in the log
somewhere).  I tried the master branch but was still able to reproduce
the bug using `emacs -q -L ~/src/org-mode/lisp`:

After using `customize-set-variable` to enable
org-enforce-todo-checkbox-dependencies, with the following agenda
file:

    * TODO blocked task
      - [ ] checkbox

Trying to clock into the task from org-todo-list results in an infinite loop.

Thanks,
Aaron

Re: Bug: Infinite loop in org-agenda-dim-blocked-tasks

[Aaron Zeng]

Hi Bastien,

Unfortunately, I think this bug is still there (I also didn't see any
commits addressing it, but I could have missed it in the log
somewhere).  I tried the master branch but was still able to reproduce
the bug using `emacs -q -L ~/src/org-mode/lisp`:

After using `customize-set-variable` to enable
org-enforce-todo-checkbox-dependencies, with the following agenda
file:

    * TODO blocked task
      - [ ] checkbox

Trying to clock into the task from org-todo-list results in an infinite loop.

Thanks,
Aaron